Device for expanding pistons.



R. S. SIMCOE.

DEVICE FOR EXPANDING PISTONS.

APPLICATION FILED JUNE 8. m7.

mwfimm Patenm De0.11,1917.

- R5 SUV/C05 v w SATES PATENT OFFICE.

nor s. SIMCOE, or CORTLAND, new roan.

:onvrcn non nxrannrne Prs'rons.

Specification of Letters Patent. Patented Deg, 11L 191?,

Application filed .1 mac 8,1917. Serial 110. 173,567.

panding Pistonsyand I do hereby declarethe following to be a full, clear, and exact Aside from the above practice, it is onlydescription of the invention, such as will enable others skilled in the art to which it appertains' to make and use the same.

This invention relates to devices for fitting pistons in engine cylinders.

The object of the invention is to provide an expanding device for insertion in the pistons of engine cylinders particularly internal combustion engines, for the purpose of expanding the latter in given directions so as to eliminate the knock in engines in which the pistons have become worn. It is at present, a common practice with machinists to block out the piston through rings inorder to avoid a knock incylinders, but this practice is undesirable in that it provides a bearing between the piston and the cylinder on a single line, and furthermore destroys some of the efiiciency of the piston rings incarrying out their other functions.

known to me, according to the present practices to turn down an over-sized piston in order to fit a cylinder, and this practice is obviously tedious and expensive.

Therefore, in order to better the above practices, I have devised an expanding device which may be inserted within a piston and expanded in a direction in which it is necessary to increase the dimension, and after the proper GXPaIISIOTI'hQS been secured, to permanently secure the expanding devlce within the piston. Inasmuch as it is seldom or never necessary to expand a piston along the line of the wrist pin, since the wrist pin steadies the piston from any knock in that direction, but always transversely thereof, the expanding device can be inserted into the piston so as to avoid the operating area. of the connecting rod in the piston. r

With the above objects in view, and such others relating to the details of construction, as may hereinafter appear, my invention will now be full set forth and described,

reference being ad to the accompanying drawings.

In the drawings: Figure 1 is a plan view of the expanding device,

Fig. 2 is a section on line 22 of Fig.1..

- Fig. 3 is a view looking into the open end of a piston, and showing the manner of mounting the expanding device therein, and Fig. 4 is a section on line 4-4 of Fig. 3. Referring more particularly to the drawings, 1 represents a piston, within which is formed the usual wrist pin bearings 2.- It is seldom necessary to expand a piston on a line with the axis of the bearings 2, but the knock in an engine usually occurs by reason of the wearing of the outer edges in the points a-a. Therefore, in order to provide a means for expandingthe piston on a line including the points a-a, l[ have devised an expanding yoke which consists, generally,

of the blocks 3 and t and the expanding rods or bolts 5. The blocks 3 and 4 are provided with the curved surfaces 6 which coincide with the inner surface of the particular piston to be expanded, and at their ends terminate in inwardly directed arms 7 and 8.

The arms 7 of the block 3 are provided with the tubular sockets or seats 9, within which are rotatably received the correspond ingly shaped ends of the bolts 5. Directly adjoining the ends 10 are the wrench heads 11, whose outer ends are adapted to bear against the ends of the arms 7 so as to provide stops to the movement of the bolts 5.

The opposite ends 12 of the bolts 5 are threaded and are received into correspond ingly threaded openings 13 formed in the arms 8 of the blocks 4, so that when the bolts 5 are rotated, the blocks 4 will be carried tov ward or away from the blocks 3. Also car-' ried upon the threaded ends 12 of the bolts 5 are the lock nuts 14 and the lock washers 15 which prevent the rotation of the bolts 5 after they have once been positioned.

In employing the expanded device, the blocks are adjusted so that they may be received .within' the piston to be set, after which the bolts 5 are rotated to expand the surfaces 6 to contact with the portions of the inner face of the piston which must be separated. Continued rotation of the bolts will expand the pistonto the desired degree with comparatively little exertion. It is very seldom necessary to expand a piston more than two or three thousandths of an inch in order to the piston in. any suitable to eliminate the knock, and this adjustment canbe secured very quickly by the use of one of my expanding devices. I

After the proper adjustment has been 'secured, and the lock nuts 14 have been positioned against the ends of the arms 8, the expanding device may be permanently secured manner.' It is my practice to bore one or more openings through the piston and into each of the blocks 3 and 4, as shown in Fig. 4, and then to thread therein a screw which will adequately position the device against loosening under any of the conditions of wear or operation of the engine.

Obviously in the manufacture of the expanding device it will only be necessary to make a limited number of sizes, since within a reasonable range, one of the expanding devices may be adjusted to pistons of a number of dimensions.

What I claim as my invention is 1. A piston expanding device, comprising in combination, a pair of heads having arcuate faces to contact the inner face of a piston, and means for separating said heads 2. A piston expanding device, comprising in combination, a pair of heads having arouate faces adapted to contact'the inner face of the piston, separating bolts connecting the heads in expansible relation, and means foring in seating a pair of opposing heads against the inner face of a piston, separating the blocks to push the piston wall outwardly, and securing the heads to the piston in their positions of adjustment.

In testimony whereof, I affix my signature in -the presence of two witnesses.

ROY S. SIMCOE. Witnesses:

EDNA M. MoLEsWoRTH, CEoILE E. DART. 

